/Engine/Source/Runtime/Engine/Classes/Engine/Engine.h
Finds any World(s) and related objects that are still referenced after being destroyed by LoadMap and logs which objects are holding the references. May rename packages for the dangling objects to allow the world to be reloaded without conflicting with the existing one.
virtual void CheckAndHandleStaleWorldObjectReferences ( [FWorldContext](API\Runtime\Engine\Engine\FWorldContext) * InWorldContext )